NDLI: Ectomycorrhizal impact on Zn accumulation of Populus tremula L. grown in metalliferous soil with increasing levels of Zn concentration

Content Provider	Springer Nature Link
Author	Langer, Ingrid Santner, Jakob Krpata, Doris Fitz, Walter J. Wenzel, Walter W. Schweiger, Peter F.
Copyright Year	2012
Abstract	Our study aimed at characterizing the Zn phytoextraction potential of a metal tolerant Populus tremula accession in symbiosis with a community of ectomycorrhizal fungi from metal-contaminated soil that is naturally forming mycorrhizae with the experimental plant. Effects of the fungal community on P. tremula development, metal translocation and accumulation properties were tested under variable Zn bioavailability.In a pot experiment, P. tremula seedlings were grown for 88 days in a substrate composed of metalliferous soil from an aspen stand and non-contaminated agricultural soil spiked with ZnSO$_{4}$ to yield total Zn additions from 0 to 80 mg kg$^{-1}$ substrate. The substrate contained the inherent mycorrhizal community of P. tremula (Nat-Myc) or was γ-irradiated to eliminate living microbial propagules (Irr-NM treatment).γ-Irradiation efficiently inhibited the formation of functional ectomycorrhizae in the control treatments. It increased dissolved organic carbon (DOC) in the substrate and increased the extractability of Zn and Cd by 1M NH$_{4}$NO$_{3}$. We found three times larger biomass and more than four times increased root lengths in the Irr-NM compared to the Nat-Myc treatments which may be explained by the doubled DOC concentrations and related Fe mobilization due to formation of labile complexes in the irradiation treatment and the absence of microbial competitors for (nutrient) resources. Our results indicate an imbalance of the normally mutualistic symbiosis between mycorrhizal fungi and the host at early growth stage, possibly further exacerbated by the high fragility and low nutrient reserves of the P. tremula seedlings obtained from a contaminated site. Foliar Zn concentrations were generally larger in the Nat-Myc treatments and exceeded those reported for numerous Salix and Populus species. While the Zn concentrations increased with increasing Zn additions, Zn translocation to shoots was inhibited at high Zn levels in the Nat-Myc treatments, indicating a barrier function of the mycorrhizal community.The observed barrier properties in the mycorrhizal treatments suggest that mycorrhizal inoculation of P. tremula may be a promising strategy to enhance revegetation and phytostabilization of metal-polluted sites. However, early-stage growth of P. tremula may be limited by imbalances between the fungal and plant partner in such nutrient-deficient, toxic environments.
Starting Page	283
Ending Page	297
Page Count	15
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	355
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-01-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ectomycorrhiza Zinc (Zn) Cadmium (Cd) Lead (Pb) Dose response Salicaceae Phytoremediation Plant Physiology Ecology Plant Sciences Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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